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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test clear and clearBuffer functions have to match fbo's buffer format</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="20" height="20"> </canvas>
<script>
"use strict";
description("This tests the WebGL2 specific constraint that clear or clearBuffer* functions have to be compatible with fbo's buffer format");

var setupRenderbuffer = function(attachment, format) {
  var renderbuffer = gl.createRenderbuffer();
  gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, attachment, gl.RENDERBUFFER, renderbuffer);
  gl.renderbufferStorage(gl.RENDERBUFFER, format, canvas.width, canvas.height);
  return renderbuffer;
}

var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas, undefined, 2);
if (!gl) {
  testFailed("context does not exist");
} else {
  testPassed("context exists");

  var fb = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

  debug("");
  debug("Signed integer buffer");

  var colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0, gl.RGBA8);
  var colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1, gl.RGBA32I);
  gl.drawBuffers([gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1]);
  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clear and INT buffer");

  gl.clearBufferfv(gl.COLOR, 1, new Float32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferfv and INT buffer");

  gl.clearBufferuiv(gl.COLOR, 1, new Uint32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferuiv and INT buffer");

  debug("Set up draw buffer so INT buffer is set to NONE");
  gl.drawBuffers([gl.COLOR_ATTACHMENT0]);
  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clear and INT buffer is NONE");

  gl.clearBufferfv(gl.COLOR, 1, new Float32Array(4));
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBufferfv and INT buffer is NONE");

  gl.clearBufferuiv(gl.COLOR, 0, new Uint32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferuiv and float buffer");

  debug("");
  debug("Unsigned integer buffer");

  colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0, gl.RGBA32UI);
  colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1, gl.RGBA8);
  gl.drawBuffers([gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1]);
  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clear and UINT buffer");

  gl.clearBufferfv(gl.COLOR, 0, new Float32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferfv and UINT buffer");

  gl.clearBufferiv(gl.COLOR, 0, new Int32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferiv and UINT buffer");

  debug("Set up draw buffer so INT buffer is set to NONE");
  gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]);
  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clear and UINT buffer is NONE");

  gl.clearBufferfv(gl.COLOR, 0, new Float32Array(4));
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBufferfv and UINT buffer is NONE");

  gl.clearBufferiv(gl.COLOR, 1, new Int32Array(4));
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferiv and float buffer");

  debug("");
  debug("Float buffer");

  colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0, gl.RGBA8);
  var numAttachments = 1;
  var ext = gl.getExtension("EXT_color_buffer_float");
  var bufferType = "float buffer";
  if (ext) {
    debug("EXT_color_buffer_float is available: testing RGBA8 + RGBA32F");
    colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1, gl.RGBA32F);
    ++numAttachments;
    gl.drawBuffers([gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1]);
  } else {
    debug("EXT_color_buffer_float is unavailable: testing RGBA8");
    gl.drawBuffers([gl.COLOR_ATTACHMENT0]);
    bufferType = "RGBA8 buffer";
  }
  shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');

  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clear and " + bufferType);

  for (var ii = 0; ii < numAttachments; ++ii) {
    gl.clearBufferfv(gl.COLOR, ii, new Float32Array(4));
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBufferfv and " + bufferType);

    gl.clearBufferiv(gl.COLOR, ii, new Int32Array(4));
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferiv and " + bufferType);

    gl.clearBufferuiv(gl.COLOR, ii, new Uint32Array(4));
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "clearBufferuiv and " + bufferType);
  }

  gl.deleteFramebuffer(fb);
  gl.deleteRenderbuffer(colorbuffer);
  gl.deleteRenderbuffer(colorbuffer1);
}

debug("");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error");
var successfullyParsed = true;

</script>
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